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Steven - I was using 4.7 and got what I thought was the usual annual update licence reminder. When I did this, however, I found I was automatically updated to new version 6 I guess because 4.7 was so old. 
It’s all been working fine until now so I tend to think this is something to do with the end of the 30 day period coming up. Perhaps there was some sort of glitch with the initial installation… ???
I had thought of uninstalling and reloading it all but I’m really new at all this stuff and don’t know anything about windows safe mode so I think I will try uninstalling via control panel and reinstalling the normal way. Then see what happens.
Thanks so much for your help.